Measurement of Stark parameters of HeII P-Alpha, P-Beta and P-Gamma spectral lines

Details Measurement of Stark parameters of HeII P-Alpha, P-Beta and P-Gamma spectral lines Measurement of Stark parameters of HeII P-Alpha, P-Beta and P-Gamma spectral lines

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5622..986m&link_type=abstract

5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications. Edited by Marcano

Physics

Optics

Scientific paper

Optical diagnostics is a known and powerful tool to obtain information concerning the processes involved inside and around plasma. In the case of helium plasmas, they are present in industrial applications, like welding or cutting processes and in scientific research, like the inertial confinement plasmas or astrophysical analysis. This work reports information on the pressure broadened profiles of the HEII Paschen-alpha (Pα), Paschen-beta (Pβ) and Paschen-gamma (Pγ) spectral lines measured in a pulsed discharge lamp. Information relative to the line shapes, full width at 1/2, 1/4 and 1/8 of the maximum intensity and the dip of the HEII 320.3 nm is provided. The electron density has been determined by two-wavelength interferometry and from the Stark width of the HEI 501.6 nm and ranges during the HeII emission from 0.54 to 0.64 1023 m-3 in the plasma. Temperature (1.7 - 2.4 eV) has been simultaneously determined from the Boltzmann-plot of HEI and from local thermodynamic equilibrium (LTE) assumptions. The final results have been compared with most of the previous existing data.

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